Peter A. Allison, Derek E. G. Briggs; Exceptional fossil record: Distribution of soft-tissue preservation through the Phanerozoic. Geology ; 21 (6): 527–530. doi: https://doi.org/10.1130/0091-7613(1993)021<0527:EFRDOS>2.3.CO;2
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Preservation of soft-bodied fossil biotas (Konservat-Lagerstäten) that preserve traces of volatile nonmineralized tissues (readily degraded by bacteria) are not evenly spaced through geologic time. When compared to outcrop area, exceptional faunas appear to be over-represented in the Cambrian and Jurassic. These concentrations in time correspond to particular environments, indicating that controls on the distribution of exceptional faunas may have operated on a global scale. The reduction in the number of exceptional faunas after the Cambrian may reflect the evolution and diversification of deep bio- turbators. Specific conditions favoring stagnation and episodic burial were required to ensure preservation in younger rocks.